CN1326117C - Ramp unit and magnetic disc apparatus - Google Patents

Abstract

The invention discloses a ramp unit, which is installed in a magnetic disk housing and makes the magnetic head stand by. The ramp unit includes: a ramp body, which guides and holds the magnetic head retracted from the magnetic disk surface; and The sleeve part is arranged integrally with the main body of the ramp, and has a threaded hole, and the threaded hole fixes the main body of the ramp relative to the housing through screws. The invention also discloses a disk device using the ramp unit.

Description

Ramp units and disk units

This application is based on and claims priority from Japanese Patent Application No. 2004-90674 with a filing date of March 25, 2004; the entire contents of which are incorporated herein by reference.

technical field

The present invention relates, for example, to a ramp unit which retracts a magnetic head at the top end portion of an arm moving on a magnetic disk surface, and to a magnetic disk device comprising a The ramp unit in .

Background technique

A magnetic disk device performs recording and playback of information using a magnetic disk as a recording medium, and the magnetic disk is held and rotated by a hub of a magnetic disk motor, thus recording/playing back information on/from the magnetic disk.

In this magnetic disk device, the magnetic head is prevented from coming into contact with the magnetic disk by an air cushion moving together with the magnetic disk. However, when the disk starts to spin from a stationary state, a sufficient air cushion cannot be obtained, and therefore, friction is generated between the head and the surface of the disk over a certain distance.

Therefore, when the magnetic disk drive is not in operation, the ramp unit is used to retreat the magnetic head from the magnetic disk surface (for example, refer to Patent Document 1 below).

The ramp unit is a resin part molded by pouring a plastic ramp unit material into a mold for injection molding, or an assembly part of a resin part and a metal sleeve. The ramp unit is fixed on the base part (eg cover or base) from the upper side or the lower side by screws.

Meanwhile, the case housing the ramp unit and the magnetic head and disk includes a base and a cover covering the base, and they are performed by inserting screws into the holes of each part and fixing them on the internally threaded part of another part. assembly.

That is, in order to install the ramp unit and to connect the base and the cover, it is necessary to prepare separate holes and install them with separate screws. Therefore, it is necessary to prepare mounting areas and connection areas respectively for them, which hinders miniaturization of devices or parts and reduction in the number of parts.

(Patent Document 1) Japanese Patent Application Laid-Open No. 2001-23325

As described above, in a conventional magnetic disk device, when assembling components, first the ramp unit is fixed to the base by screws, and then the base portion and the cover as built-in components are respectively fixed by screws. Therefore, this increases the number of mounting and connection processes, and increases the number of parts. In addition, it is necessary to separately prepare an installation area or a connection area, and there is a problem that miniaturization of the device cannot be performed.

Contents of the invention

The present invention is intended to solve these problems, and an object of the present invention is to provide a ramp unit and a magnetic disk device which contribute to miniaturization of the entire device and reduction in the number of parts used, and enable cost reduction.

One aspect of the present invention provides a kind of ramp unit, it is installed in the casing that magnetic disk is housed, and makes magnetic head be in standby state, and described casing has a base and a cover body, and this ramp unit comprises: ramp main body , the ramp body guides and retains the magnetic head retreating from the disk surface; and a sleeve part, which is arranged integrally with the ramp body and has a taphole that passes a screw to make the ramp The body is fixed relative to the base and the ramp body is fixed relative to the cover by another screw.

In addition, a magnetic disk device according to an aspect of the present invention includes: a magnetic disk; a housing that houses the magnetic disk, the housing having a base and a cover; a head moving mechanism that includes an arm and a magnetic head supported by the arm, And the magnetic head is moved on the magnetic disk surface through the arm; the ramp main body guides and supports the magnetic head retreated from the magnetic disk surface by the magnetic head moving mechanism; the sleeve part is arranged integrally with the ramp main body , and has a threaded hole, which is used to fix the ramp body relative to the casing; a first screw, which fixes the base of the casing from the underside to the threaded hole of the sleeve part; the second A second screw secures the cover of the housing to the threaded hole of the sleeve part from the upper side.

Description of drawings

FIG. 1 is an exploded perspective view showing a magnetic disk device according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing the ramp unit shown in FIG. 1 .

Fig. 3 is an enlarged plan view showing a ramp unit shown in Fig. 1 .

Fig. 4 is an enlarged cross-sectional view showing a part of the magnetic disk device shown in Fig. 1 .

Fig. 5 is a plan view showing the sleeve member shown in Fig. 4 .

Fig. 6 is a side view showing the sleeve member shown in Fig. 4 .

Fig. 7 is a sectional view of the sleeve member shown in Fig. 5 along the line A-Aa.

Fig. 8 is a sectional view of the sleeve member shown in Fig. 6 along line B-Ba.

Detailed ways

Embodiments of the present invention will be described below with reference to the accompanying drawings, but these drawings are for explanatory purposes only and do not limit the present invention.

In the ramp unit according to one aspect of the present invention, the sleeve member is integrally provided with a ramp body functioning as a receding portion of the magnetic head, and has threaded holes for fixing the ramp body to the housing by screws. The main body of the ramp is axially sandwiched between the base and the cover that make up the housing, and the screws are inserted into the threaded holes from the upper side of the cover and the lower side of the base, so that the main body of the ramp is fixed on the housing at the same time And connect the base and the cover that make up the shell. Therefore, there is no need to prepare areas for screwing the screws for fixing the ramp body and connecting the base and the cover respectively, which facilitates the miniaturization of the entire device, reduces the number of parts used, and reduces costs.

Moreover, a magnetic disk device according to an aspect of the present invention includes a base and a cover capable of mounting a sleeve member so as to sandwich it from the upper side and the lower side in the axial direction, the base and the cover They are fixed together by screwing screws into the threaded holes of the sleeve part from each side respectively, therefore, the screw parts can be reduced and made thinner, and moreover, the housing can be assembled quickly.

Here, the above-mentioned sleeve may have a structure including a flange portion for positioning together with a positioning hole arranged on an upper surface of the ramp body when the ramp body is mounted on the housing. Among them, the ramp unit can be automatically arranged at a specific position on the base of the housing by using a robot arm or the like, and thus, the assembly efficiency of the ramp unit can be improved.

In addition, the above-mentioned housing may include a base and a cover for mounting the sleeve member so as to sandwich the sleeve member from the upper side and the bottom side in the axial direction, and may be configured to be screwed into the sleeve from each side by screws respectively. The base and cover are secured together in the threaded holes of the components. Here, screw parts for mounting the base and the cover of the housing relative to the ramp unit can be reduced.

Also, the above-mentioned sleeve member is cylindrical and includes a rotation preventing portion relative to the ramp main body, the rotation preventing portion being formed on a part of the outer peripheral surface and forming a flat, concave or convex shape. In this way, when the screw is screwed into the threaded hole of the sleeve component, the sleeve component can be prevented from idling relative to the ramp main body, and the screw connection between the ramp main body and the housing can be ensured.

In addition, the above-mentioned flange portions may include cutouts partially cut away so as to clamp their outer peripheral surfaces, so that the cutout surfaces can be used for clamping, transfer and positioning, etc., for mounting the ramp unit by a robot arm or the like.

That is, in general, by using a sleeve member arranged integrally with the ramp main body and having a rotation preventing portion, fixing the ramp main body to the base, etc. and connecting together the base and the cover constituting the case can be achieved by This is achieved by screwing together in the same area, thus making it possible to miniaturize the device as a whole and reduce the number of parts used.

Therefore, embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a magnetic disk device according to an embodiment of the present invention. As shown in the figure, the magnetic disk device includes a base 11, an arm 12, a magnetic disk 13, a ramp unit 14, a top yoke 15, a cover 16, and the like.

An arm 12, a magnetic disk 13, a ramp unit 14, and a top yoke 15 are provided on the base 11, and the cover 16 is covered from above, so that the inside of the cover 16 will be separated from the outside. The case K of the magnetic disk device includes a base 11 and a cover 16 .

The arm 12 includes a head subassembly having a magnetic head at a top end portion for data recording and playback, and is rotatably supported on the base 11 by a support unit 17 . The arm 12 is driven by a voice coil motor and moves between the surface of the disk 13 and the ramp unit 14 . The head moving mechanism that moves the head supported on the surface of the magnetic disk 13 by the arm 12 includes these components.

The magnetic disk 13 is sandwiched between a hub (not shown), which rotates around the motor shaft, and a holder 18 . The motor for driving the magnetic disk 13 includes magnets mounted on a hub and coils arranged around these magnets.

The ramp unit 14 is installed in the housing housing the magnetic disk 13 and functions as a retracted position to guide and hold the magnetic head receding outward from its position on the surface of the magnetic disk 13 until it starts to operate, so that when the magnetic disk 13 is not In operation, the magnetic head does not collide and scratch the surface of the magnetic disk 13 due to vibration or the like. The ramp unit 14 also acts to back the head to a different position from the surface of the disk 13 when the operation starts, until the rotation of the disk 13 reaches a minimum speed enabling the head to float above the surface of the disk 13 .

The top yoke 15 is part of a voice coil motor that drives the base of the arm 12 through a support unit 17 . Insertion holes for the screws 19 , 20 are drilled at positions of the base 11 and the cover 16 facing each other. Screws 19 , 20 can be screwed onto ramp unit 14 from above and below through insertion holes 21 , 22 .

Details of the ramp unit 14 are shown in FIGS. 2 and 3 . FIG. 2 is a perspective view of the ramp unit 14 , and FIG. 3 is a plan view of the ramp unit 14 . FIG. 4 is a longitudinal sectional view of main parts of the ramp unit in a state of being mounted on the casing K. As shown in FIG. The ramp unit 14 generally has the shape of a deformed elongated pentagon protruding from the mounting perimeter within the housing K.

The ramp unit 14 includes: a ramp body 14a made of a resin (for example, a liquid crystal polymer such as polyacetal) having a low coefficient of friction and good lubricating characteristics; a sleeve member 14b, which 14b is made of metal (for example, SUS, etc.) partially surrounded by the ramp main body 14a. That is, the sleeve member 14b is arranged integrally with the ramp main body 14a. The ramp body 14a guides and supports the head retreating from the surface of the magnetic disk 13. As shown in FIG.

For example, the sleeve member 14b is placed in a mold for injection molding, and polyacetal as a ramp resin material is cast around the sleeve member 14b. Thus, the ramp unit is formed by insert molding of the sleeve member 14b.

The ramp unit 14 is arranged on the base 11 and on the peripheral portion of the magnetic disk 13 . On one side surface of the ramp main body 14a, an inclined guide 23 (for guiding the tip end portion of the arm 12) as a guide surface in an inclined state is formed from the end near the sleeve member 14b to the other end. The ramp unit 14 (ramp body 14 a ) retreats the head moved by the head moving mechanism, which is composed of a head hub assembly, a voice coil motor, etc., from the surface of the magnetic disk 13 .

The inclined guide 23 slidably guides the top end portion of the arm 12 or the continuously provided head supporting member so that the magnetic head (not shown) retracts and recedes from the surface of the magnetic disk 13 smoothly. The slope and length of the inclined guide 23 are set so that the magnetic head is retracted smoothly.

5 and 6 are a plan view and a side view of the above-mentioned sleeve member 14b. In addition, FIG. 7 is a sectional view of the sleeve member 14b in FIG. 5 along the line A-Aa, and FIG. 8 is a sectional view of the sleeve member 14b in FIG. 6 along the line B-Ba. The sleeve member 14b has a cylindrical shape as a whole, and annular flange portions (flanges) 24, 25 having a predetermined thickness are arranged at the upper and lower peripheries of both end portions of the sleeve member. At the outer periphery of each flange portion 24, 25 are formed substantially parallel cut flat cut surfaces 24a, 25a for positioning.

In addition, a ring portion 26 as a rotation preventing portion is protrudingly provided at an axially substantially central portion of the sleeve member 14b. A pair of substantially parallel cut flat cutout surfaces 26a for preventing rotation are formed on the outer peripheries of the ring portions 26, respectively. After the above-mentioned insert molding, the outer periphery of the sleeve member 14b (including the ring portion 26) is surrounded by the ramp body 14a made of polyacetal. Accordingly, sleeve member 14b is prevented from rotating relative to ramp body 14a by cutout surface 26a. As the rotation preventing portion, instead of providing a flat cutout surface at the ring portion 26, for example, a part of the outer peripheral surface of the sleeve member 14b may be processed into a concave or convex state.

A threaded hole 27 of an internal thread is formed entirely in the inner periphery of the cylindrical hole of the sleeve member 14b. The thread diameter of this threaded hole 27 is such that the screws 19 , 20 shown in FIG. 1 can be screwed together. That is, the sleeve member 14b has threaded holes 27 for fixing the ramp main body 14a relative to the housing K by screws. The screws 19, 20 fix the sleeve member 14b and the housing K together from the outside of the housing K through the threaded holes 27 of the sleeve member 14b.

On the ramp body 14a, a positioning hole 28 shown in FIGS. 2 and 3 is formed at a position away from the sleeve member 14b. The positioning hole 28 is used when the ramp unit 14 is clamped (clamped) by the cutout surface 24a of the flange portion 24 to transfer and position it at a predetermined position in the housing K. As shown in FIG. That is, these positioning holes 28 and the cutout surface 24a of the flange portion 24 serve as a portion gripped by a robot arm or the like.

The ramp unit 14 including the sleeve member 14b and the ramp main body 14a is fitted in the housing K in the following manner. First, the above-mentioned ramp unit 14 is arranged on the base 11 . At this time, the threaded hole 27 of the sleeve member 14 b matches the insertion hole 22 of the base 11 .

Then, after the various housing parts such as the magnetic head 13 and the arm 12 are definitely set, the cover body 16 is placed on the base 11 . At this time, the insertion hole 21 of the cover body 16 coincides with the upper part of the threaded hole 27 of the sleeve member 14b. In this way, the positions of the insertion holes 21 and 22 and the threaded hole 27 match. Therefore, the screws 19, 20 are screwed into the screw holes 27 of the sleeve member 14b through the respective insertion holes 21, 22 from the upper side of the cover body 16 and the lower side of the base 11, respectively.

Therefore, the ramp unit 14 is fixed in the housing K by the sleeve part 14b and the screws 19, 20 screwed together with each other. That is, the sleeve part 14b is used to fix the ramp main body 14a in the casing K, and is also used to connect the base 11 and the cover 16 constituting the casing K.

Therefore, in this ramp unit 14 no additional area needs to be prepared for the above-mentioned fixing or connection to the housing K. Therefore, the magnetic disk device can be miniaturized. Also, the number of provided screws 19, 20, screw holes 27, etc. can be reduced, and therefore, the workability of assembly is improved, and the cost can be reduced.

As described above, according to the ramp unit 14 of the present embodiment, the threaded hole 27 is used to fix the ramp main body 14a to the housing K by screws, and is on the ramp main body 14a serving as the retreat portion of the magnetic head. Therefore, when the screws 19, 20 are threaded into the threaded holes 27, the ramp main body 14a can be fixed on the housing K and the base 11 and the cover 16 constituting the housing K can be connected simultaneously.

Therefore, there is no need to prepare areas for screwing the screws 19, 20 for fixing the ramp main body 14a and connecting the base 11 and the cover body 16, respectively, so that the entire device can be miniaturized, the number of parts can be reduced, and the cut costs.

Furthermore, according to the magnetic disk device of the present embodiment, the screws 19, 20 are screwed into the screw holes 27 of the ramp unit 14, so that the sleeve member 14b and the cover 16 of the base 11 of the case K can be fixed together. Therefore, the working efficiency of assembling the magnetic disk device can be improved.

The present invention is not limited to the particular forms described, but it is to be understood that all changes and modifications which do not depart from the scope of the following claims are intended to be embraced therein.

Claims (5)

1. a ramp unit, it is installed in the shell that magnetic disk is housed, and makes magnetic head be in stand-by state, and described shell has a base and a cover body, and this ramp unit comprises: a ramp body that guides and retains the head retreating from the disk surface; and A sleeve part arranged integrally with the ramp body and having a threaded hole for fixing the ramp body relative to the base by a screw and securing the ramp body relative to the cover by another screw body fixed. 2. The ramp unit of claim 1, wherein: The sleeve member is cylindrical and has a rotation preventing portion relative to the ramp body, wherein a part of an outer peripheral surface of the rotation preventing portion is formed as a flat surface, a concave state, or a convex state. 3. The ramp unit of claim 1, wherein: The ramp main body has positioning holes on its upper surface, the sleeve member has a flange portion for being supported when the ramp main body is mounted on the housing, and the positioning holes of the ramp main body are located on the ramp. Used to position the ramp body when mounted on the housing. 4. The ramp unit of claim 1, wherein: The flange portion of the sleeve member has a cutout portion so as to sandwich an outer peripheral surface of the flange portion of the sleeve member. 5. A magnetic disk device, comprising: disk; a casing, the casing is equipped with a magnetic disk, and the casing has a base and a cover; a magnetic head moving mechanism comprising an arm and a magnetic head supported by the arm, and causing the magnetic head to move on the magnetic disk surface through the arm; a ramp body that guides and supports the magnetic head retreating from the magnetic disk surface by the magnetic head motion mechanism; a sleeve part, the sleeve part is arranged integrally with the ramp main body, and has a threaded hole, and the threaded hole is used to fix the ramp main body relative to the shell; a first screw that fixes the base of the housing to the threaded hole of the sleeve part from the underside; A second screw that fixes the cover of the housing to the threaded hole of the sleeve part from the upper side.

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